<?php

  echo 2 * '123', "\n";
  echo 2 * '123abcd', "\n";
  echo 2 * '123abcd12', "\n";
  # Octal Number[ number with leading zero(0)]
  echo 0123 , "\n";
  echo 0123864 , "\n";
  //   0    1     2       3
  //
  //  64 32 16 8 4 2 1
  //  1   0  1 0 0 1 1
  //  64 + 16 + 2 + 1 = 83
